The Study of Impacts of Rapid Weight Loss on Taekwon-Do Athletes’ Specific Performance and Renal Function

• Main Authors: Cha-Lin Wu, 吳奇霖
• Other Authors: none
• Format: Others
• Language: zh-TW
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/30891726528447500979

碩士 === 國立體育學院 === 教練研究所 === 95 === Purpose: The amount of trace albumin, uric acid, and urea ammonia were used as indicators of renal damage. These figures were used to discuss the changes of the body’s composition and changes of electrolytes before and after different degrees of weight loss of a Taekwon-Do players. Method: 24 subjects were divided equally into three groups (3% weight-loss group, 5% weight-loss group, and the control group) according to weight division. The weight-losing subjects were using the calorie-limit method with jogging and usual training routines. Subjects were also asked to take blood and urine samples before and after the weight loss; another urine sample was taken 5 days after ending the weight loss. Results: (1) The body fat, muscle mass, and total body water of the 5% group was obviously lower after the weight loss (p <.05). The muscle mass and total body water of the 3% group were obviously lower after the weight loss (p<.05). (2) Both 2 weight-loss groups showed an evident rising in trace albumin and uric acid (p<.05), and the 5% group being higher than the 3% group (p <.05). Both groups were recovered after 5 days the end of the weight loss. (3) After the rapid weight loss, the amount of natrium ions in the blood dropped significantly (p <.05), and the 5% group dropped lower than the 3% group (p <.05). The amount of kalium ions in the blood of the 3% group rose significantly (p <.05). (4) The kickboxing performance of the 5% group was significantly lower than before the weight loss (p <.05). The 3% group did not show significant difference from the control group (p >.05). Conclusion: This research found that short periods of rapid weight losing might cause renal damage. Although this seems to be recoverable, however, if done repeatedly in the long term, the potential permanent damage to the kidney is still unknown. The more the weight loss, the larger physical damage it causes and the lower the performance.